Screening or separating machine.



. J. STURTEVANT.

G OR SEPARATING MACHINE.

APPLICATION FILED DEC. 29, 1916,

SCREENIN Patented June 12, 1917.

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T .'J. STURTEVANT. SCREENING 0R SEPARATING MACHINE.

APPLICATION FILED DEC. 29.1916- Patented June 12, 1917.

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T. J. STURTEVANT.

SCREENING OR SEPABATING MACHINE.

APPLICATIQN FILED DEC. 29 1916- 1 ,QQ9,81 3;. Patented June 12, 1917.

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IINITED @TATEd PATENT OFFllfiE.

THOMAS JOSEPH STURTEVANT, OF WELLESLEY, MASSACHUSETTS, ASSIGNOR TO STURTEVANT MILL COMPANY, A CORPORATION OF MAINE.

SCREENING OR SEPARATING MACHINE.

Application filed. December 29, 1916.

To all whom it may concern:

Be it known that I, THOMAS J. Sronrn- VANT, a citizen of the United States, residing at Nellesley, in the county of Norfolk and State of Massachusetts, have invented or discovered certain new and useful Improvements in Screening or Separating Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certainimprovements in that class of inclined screening or separating machines shown in the Sturte' vant U. S. Patents Nos. 1,035,262 and 1,114,064, and the invention has for its object to improve the efficiency and convenience of machines of this class.

In the present improved machines the screen members are elastically suspended from the covers of the machines, and on which covers the operating mechanisms for percussively jarring the screen members are mounted. By thus elastically suspending the screen members from the covers of the machines great efficiency of operation is secured, and convenient access of the screen members is afforded by lifting'the hinged covers, all as will hereinafter more fully appear.

In the accompanying drawings Figure 1 is a side view of an inclined screening or separating machine embodying the present invention. Fig. 2 is a front view of the same. Fig. 3 is a section through the screen box or casing on line 3-3, Fig. 1. Figs/1 and 5 are detail views illustrating a preferred construction for removably mounting the clothing for the fine wire mesh screen in place.

Referring to the drawings, 12 denotes the screen box or casing within which the screens are inclosed and which is mounted in an inclined position on frame parts or supports 13. Fixed to the upper end of the screen box or casing is a feedbox 14 from which the material is distributed to the screens by means of screw conveyer 15 mounted on a shaft 16 provided with a pulley 17 which will be belted to any suitable source of power. The shaft 16 is provided with a second pulley 18 belted to a pulley 19 on one of the shafts 20 mounted in suitable standards 21 on the cover 22 of the screen box or casing, said shafts being provided with pulleys 23 which are belted together Specification of Letters latent.

Patented June 12, 1917.

Serial No. 139,555.

so that the lower shaft will be driven from the upper shaft. The shafts 20 are provided with arms 20 for lifting the jarring hainmers 20 acting on the impact bars 23, this construction of the arring mechanism being similar to the jarring mechanisms shown and described in the Sturtevant patents above referred to.

In the form of the invention most clearly illustrated in Fig. 3 elastic sheet metal plates 24, serving as supports for the screen ing members, are attached to the hinged cover 22 of the screen box or casing, the upper ends of these supports being bent to form inwardly extending parts 24 approximately at right angles to the bodies or main portions of said plates and which are suitably attached, near their outer edges, as by rivets 25, to the said cover 22. In the preferred construction of these plates 24, as shown in Fig. 3, angle bars 26 and 27 are riveted or otherwise attached to the said plates 24, these angle bars affording inwardly extending flanges serving as supports for the screens or screen parts.

The screen clothing 28 for the upper screen, which is a coarse or scalper screen, is attached to side frame parts 29, formed as angle bars, and resting on the ledges afforded by the inwardly extending parts of the angle bars 26, this construction permitting the coarse or scalper screen to be readily inserted endwise from the open bottom of the screening chamber, while the wire mesh screen is removably attached to the inwardly extending parts of the angle bars 27, as more clearly shown in the detail views Figs. 4 and 5. In the construction shown in the figures just referred to the inwardly extending parts or flanges of the angle bars 27 are provided with a series of holes for the reception of pointed pins 31 attached to clamping bars 32 between which and the said inwardly extending parts or flanges of said angle bars 27 the fine wire mesh cloth 30 is clamped by means of screws 33 tapped in lugs 34 secured to the plates'24, said screws 33 being provided with lock-nuts 34 by which they may be prevented from turning after having been screwed up to clamping positions.

The fine wire mesh screen cloth 30, after having been clamped in place as just described, may be stretched and held taut by means of screws 35 tapped in blocks 36 secured to the cover 22, said screws impinging against the inner ends of the bends or arms 24 of the side plates 24 in such a manner that by turning said screws down the lower edges of the plates 24: will be forced outward so as to stretch said fine wire mesh screen cloth and hold the same taut.

The impact bars 23 pass loosely through guides 37 mounted on the cover 22 and also through guides 38 mounted on the clothing 28 of the coarse or scalper screen and which clothing is clamped between said guides 38 and plates 39 riveted to the foot portions of the said guides 38. The lower ends of the impact bars rest loosely in sockets 39 riveted to protection plates 40 attached to the fine wire mesh screen clothing 30, and to the ends of said plates 40 smaller plates 41 are preferably attached; said plates 41 having loose or slotted connections with screw studs 42 mounted on the inwardly extending parts of the angle bars 27, this construction permitting a certain limited freedom of movement between said plates 41 and the angle bars 27 when the fine wire mesh screen cloth is being stretched, this freedom of movement being also desirable when said screen clothing is percussively jarred by the impact bars 23.

In the construction above described it will be understood that a screening chamber, within and independent of the screen casing 12, will be afforded by the side plates 24, the screen members, andthe cover 22 and from which cover said side plates and screen members are elastically supported. It will also be understood that the construction show-n for clamping the wire mesh cloth for the fine screen affords convenient means for removably mounting such fine mesh cloth in place.

The invention is not to be understood as being limited to the details herein shown, as such details may be varied widely, within the province ofmechanical skill, without departing from the scope of the invention as defined by the claims hereunto appended.

Having thus described my invention 1 claim and desire to secure by Letters Patent 1. In a separator, the combination with a casing provided with a cover at its top, of a screen member, means for resiliently supporting said screen member from said cover so that it may spring upwardly and clownwardly, and means for percussively jarring saidscreen member.

2. In a separator, the combination with a casing provided with a'cover at its top, of a plurality of screen members, means for resiliently supporting said screen members from said cover,=so that they may spring upwardly'and downwardly, and means for-percussively jarring one or more of said screen members. I

3. Ina separator, the combination with a casing provided with a cover at its top, of a screen member, means for resiliently supporting said screen member from said cover, so that they may spring upwardly and down wardly, and means for percussively jarring said screen member, the operating mechanism for the jarring means being mounted on said cover.

4. In a separator, the combination with a casing provided with a cover at its top, of a plurality of screen members, means for resiliently supporting said screen members from said cover, so that it may spring upwardly and downwardly, and means for percussively jarring one or more of said screen members, the operating mechanism for the jarring means being mounted on said cover.

5. In a separator, the combination with a casing provided with a cover at its top, of a screen member, means for resiliently supporting saidscreen member from saidcover, independently of said casing, means for percussively jarring said screen member, and screen clothing stretching and tensioning means also supported by said cover.

6. In a separator, the combination with a casing provided with cover at its top, of a plurality of screen members, means for resiliently supporting said screen members from said cover, independently of said casing, means for p'erciissively jarring one or more of said screen members, and screen clothing stretching or tensioning means also supported by said cover.

'7. In a separator, *the combination with a casing provided with a cover at its top, of a screen member, means for resiliently supporting said screen member from said cover, independently of said casing, means for percussively jarring said screen member, the operating mechanism for the jarring means being mounted on said cover, and screen clothing stretching or tensioning means also supported by said cover.

8. In a separator, the combination with a casing provided with a cover at its top, of a plurality of screen members, means for resiliently supporting said screen members from said cover, independently of said casing, means for percussively jarring one or more of said screen members, the operating mechanism for the jarring means being mounted on said cover, and screen clothing stretching or tensioning means also supported by said cover.

9. In a separator, the combination with a casing provided with a cover, of resilient side plates supported by said cover independently of said casing, wire mesh screen cloth connected with said resilient side plates, and means, also supported by said cover, for springing said side plates and thereby stretching or tensioning said screen cloth. v

10. In a separator, the combination with a casing provided with a cover, of resilient side plates supported by said cover independently of said casing, wire mesh screen cloth removably connected with said resilient side plates, and means, also supported by said cover, for springing said side plates and thereby stretching or tensioning said screen cloth.

11. In a separator, the combination with a casing provided with a cover, of resilient side plates attached to said cover and hav ing inwardly extending bent top portions, screws mounted on said cover and engaging the inner parts of said bent portions, and wire mesh screen cloth connected with said resilient side plates; whereby, by adjusting said screws, said side plates may be sprung outward to stretch said wire mesh cloth and hold the same taut. v

12. In a separator, the combination with a casing provided with a cover, of resilient side plates attached to said cover and having inwardly extending bent top portions, screws mounted on said cover and engaging the inner parts of said bent portions, and wire mesh screen cloth removably connected with said resilient side plates, whereby, by adjusting said screws, said side plates may be sprung outward to stretch said wire mesh cloth and hold the same taut.

13. In a separator, the combination with a casing provided with a cover, of resilient side plates suspended from said cover and provided with inwardly extending flanges and with lugs below said flanges, clamping bars also below said flanges, wire mesh cloth the edges of which extend between said flanges and said bars, and screws tapped in said lugs and by means of which said bars may be forced upward to clamp said wire mesh cloth between said bars and said flanges.

14. In a separator, the combination with a casing provided with acover, of resilient side plates suspended from said cover and provided with inwardly extending flanges having holes, and with lugs below said flanges, clamping bars also below said flanges, said bars being provided with pointed pins registering with said holes, wire mesh cloth the edges of which extend between said flanges and said bars, and screws tapped in said lugs and by means of which said bars may be forced upward to clamp said wire mesh cloth between said bars and said flanges.

15. In a separator, the combination with a casing provided with a cover, of resilient side plates suspended from said cover and provided with inwardly extending flanges, clamping bars below said flanges, wire mesh cloth the edges of which extend between said flanges and said bars, and means by which said bars may be forced upward to clamp said wire mesh cloth between said bars and said flanges.

In testimony whereof I afiix my signature.

THOMAS JOSEPH STURTEVANT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of ratents, Washington, D. G. 

